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Poster: elbow1126 Date: Mar 10, 2008 9:57pm
Forum: GratefulDead Subject: a geeky technical question about wall of sound era soundboards

I am pretty naive about this stuff so this maybe be pretty stupid. I have always noticed that soundboards from this era sound a bit different than other soundboards. I was curious why this was the case. I understand that the wall of sound was quadrophonic so i guess one possibility is that soundboard tapes in stereo would lose some aspects of the sound. However i don't think the sound is bad (some 73 boards sound funny to me but not 74). I was thinking another possibility was the out of phase noise canceling mics that were used to allow the wall to be a self monitoring system without feedback. I always assumed that any noise from the crowd in a board were those picked up by mics on the stage, but if I understand the way these mics worked, they should have removed any sounds that did not come through the top mic. Could that affect the sound we hear on the boards?

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Poster: Earl B. Powell Date: Mar 11, 2008 7:53am
Forum: GratefulDead Subject: Re: a geeky technical question about wall of sound era soundboards

Although the microphones used for vocal purposes were noise cancelling, the drums were miked with stock units allowing for some crowd noise bleeding through. In addition, the noise cancelling was effective for the only the matched frequencies going through each specific vocal mike, to counteract feedback - so there was still plenty of onstage bleed to be heard from other sources. The loss of the quadrophonic signal and the associated compression into stereo may also play a role in the sound quality of SBD's available from the era.

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Poster: elbow1126 Date: Mar 11, 2008 8:43pm
Forum: GratefulDead Subject: Re: a geeky technical question about wall of sound era soundboards

Thank you Earl. I knew you would come through for a question like this.

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Poster: mcgannahan Date: Mar 10, 2008 10:20pm
Forum: GratefulDead Subject: Re: a geeky technical question about wall of sound era soundboards

ask owsley. he might email you back with a 10 thousand word essay on the wall of sound.

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Poster: elbow1126 Date: Mar 11, 2008 7:09am
Forum: GratefulDead Subject: Re: a geeky technical question about wall of sound era soundboards

Thanks for the advice, could please forward his email address to me?

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Poster: veblen Date: Mar 10, 2008 10:54pm
Forum: GratefulDead Subject: Re: a geeky technical question about wall of sound era soundboards

though it might be more like a thousand words and nine pictures of speakers...

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Poster: dead-head_Monte Date: Mar 11, 2008 10:42am
Forum: GratefulDead Subject: Re: a geeky technical question about wall of sound era soundboards

"The Grateful Dead sound system is really 11 independent systems..." Information description by Ron Wickersham (Alembic, Ampex) - Wall Of Sound. 1975. Information and resource from GD News letter.

Wall of Sound docs

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Poster: Edsel Date: Mar 11, 2008 7:27am
Forum: GratefulDead Subject: Re: a geeky technical question about wall of sound era soundboards

yes